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The AWS SDK for Java with support for OSGi. The AWS SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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/*
 * Copyright 2010-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */
package com.amazonaws.services.s3.model;
import java.io.Serializable;

import java.security.KeyPair;
import java.util.HashMap;
import java.util.Map;

import javax.crypto.SecretKey;

/**
 * The "key encrypting key" materials used in encrypt/decryption. These
 * materials may be either an asymmetric key pair or a symmetric key but not
 * both.
 */
public class EncryptionMaterials implements Serializable {
    private final KeyPair keyPair;
    private final SecretKey symmetricKey;
    private final Map desc = new HashMap();

    /**
     * Constructs a new EncryptionMaterials object, storing an asymmetric key pair.
     * 
     * @param keyPair
     *      The asymmetric key pair to be stored in this EncryptionMaterials object.
     */
    public EncryptionMaterials(KeyPair keyPair) {
        this(keyPair, null);
    }

    /**
     * Constructs a new EncryptionMaterials object, storing a symmetric key.
     * 
     * @param symmetricKey
     *      The symmetric key to be stored in this EncryptionMaterials object.
     */
    public EncryptionMaterials(SecretKey symmetricKey) {
        this(null, symmetricKey);
    }

    /**
     * Base constructor for the EncryptionMaterials object.  This is not publicly visible since
     * it should not be possible to create an EncryptionMaterials object that contains both an
     * asymmetric key pair and a symmetric key.
     */
    protected EncryptionMaterials(KeyPair keyPair, SecretKey symmetricKey) {
        this.keyPair = keyPair;        
        this.symmetricKey = symmetricKey;
    }

    /**
     * Returns the key pair stored in this EncryptionMaterials object.
     * 
     * @return the key pair stored in this EncryptionMaterials object.
     *      
     */
    public KeyPair getKeyPair() {
        return this.keyPair;
    }    

    /**
     * Returns the symmetric key stored in this EncryptionMaterials object.
     * 
     * @return the symmetric key stored in this EncryptionMaterials object.
     */
    public SecretKey getSymmetricKey() {
        return this.symmetricKey;
    }

    /**
     * Returns a snapshot of the current material description; never null.
     */
    public Map getMaterialsDescription() {
        return new HashMap(desc);
    }

    /**
     * Returns null since the EncryptionMaterials base class does not have a materials accessor.
     * Subclasses may override this method.
     * 
     * @return null
     */
    public EncryptionMaterialsAccessor getAccessor() {
        return null;
    }

    /**
     * Fluent API to add material description.
     */
    public EncryptionMaterials addDescription(String name, String value) {
        desc.put(name, value);
        return this;
    }

    /**
     * Fluent API to add all the given material descriptions.
     */
    public EncryptionMaterials addDescriptions(Map descriptions) {
        desc.putAll(descriptions);
        return this;
    }

    /**
     * Returns true if this is a KMS material description; false otherwise.
     * 
     * @return false by default
     */
    public boolean isKMSEnabled() {
        return false;
    }

    /**
     * @throws UnsupportedOperationException by default
     */
    public String getCustomerMasterKeyId() {
        throw new UnsupportedOperationException();
    }
    
    protected String getDescription(String name) {
        return desc.get(name);
    }
}